Table 3.

Assessment of the study quality

Qualitative studies
Study	Total score /20 points	Total score /100%
Charlton et al. [20] (2017)	20	100%
Charlton et al. [28] (2016)	17	85%
Adams & Tyson. [17] (2000)	16	80%
Johnston et al. [25] (2010b)	13	65%
Fischer [26] (2019)	6	30%
Häcker & Offterdinger [15] (2019)	4	20%
Hierholzer et al. (2013) [16]	4	20%
Quantitative studies
Study	Total score /22 points	Total score /100%
Aziz et al. [29] (2017)	22	100%
Schwickert et al. [31] (2016)	21	95%
Ardali et al. [21] (2019)	20	91%
Ariana et al. [14] (2012)	20	91%
Fleming & Brayne [22] (2008)	20	91%
Gurley et al. [18] (1996)	20	91%
Heinbüchner et al. [23] (2010)	20	91%
Reece & Simpson [19] (1996)	19	86%
Bourke et al. [30] (2008)	18	82%
Johnston et al. (2010a) [24]	18	82%
Alexander et al. [32] (1997)	17	77%
Simpson & Salkin [27] (1993)	12	55%